NOTE: This file has been updated on December 14 2021. An error in the September 6 2021 version of the file resulted in the state field from ~300k 
systems being incorrectly coded as '-1' instead of the correct state. This has been fixed in this version. Please email ndarghouth@lbl.gov with 
any questions.

ZIP_TRACT_122021.xlsx: Downloaded from HUD on 2/10/2022
https://www.huduser.gov/portal/datasets/usps_crosswalk.html#data